damping have been addressed. Fork oil volume has been
increased by 5cc, and the low-speed compression has
( 5) Aesthetics. Gone are the silver Excel rims; in their
place are black-anodized rims for a more race-inspired
look. The YZ250F also receives a gold D.I.D. chain with
corrosion-resistant plating. Back by popular demand
are the impervious in-mold graphics—only with a new
design—embedded into the plastic.
Q: WHAT CHANGES WERE WE HOPING
THAT YAMAHA WOULD MAKE TO THE 2015
A: Since we didn’t foresee monumental
changes to the 2015 Yamaha YZ250F, the fact that
Yamaha addressed a number of our quibbles on the 2014
model—notably airbox access and chassis balance—were
bonuses. We are pleased with the YZ250F’s updates,
even though the list is short.
For over a decade we lambasted Yamaha’s engineers
for their inability to take any technological leaps forward
with the YZ250F. The YZ250F stayed pretty much the
same for 12 years. As fond as the MXA test crew is of
the proven Keihin FCR carburetor, the YZ250F was
getting leapfrogged over by the competition because the
bike had stagnated. All that changed last year.
For 2014, Yamaha answered our wishes and
went the extra mile. The 2014 YZ250F underwent a
metamorphosis. The 2015 model shows that Yamaha’s
engineers listen to the buying public. Revised fork
settings? Yep. Better chassis balance? No problem.
Easier access to the air filter? Done.
Q: WHAT IS THE MOST IMPRESSIVE TRAIT
OF THE 2015 YAMAHA YZ250F?
A: There are several reasons why the Yamaha
YZ250F has been tops in the 250 Nationals this
summer. You can argue that Jeremy Martin, Cooper
Webb and Christophe Pourcel race a radically different
version of the YZ250F, but that’s not entirely true. Martin
and the oddly named (and horrendously spelled) Yamaha
bLU cRU support program may have access to modified
equipment, but they start with the same basic engine
and chassis platform as the rest of us. The 2014 model
was the best YZ250F produced to date, and the 2015
model builds on that accolade.
What is the most impressive trait of the 2015 Yamaha
YZ250F? Plain and simple, the engine. From an engineering standpoint, the YZ250F layout is a marvel. The
cylinder is slanted rearward for less gyroscopic effect.
The 44mm Keihin throttle body uses a downdraft intake
tract to maximize fuel delivery. The wraparound exhaust
Updates: All new last year, the YZ250F received
a modicum of changes for 2015. Yamaha’s
focus was on increasing durability, ease of
operation, aesthetics and slightly more power
across the entire spread.